| Section2 = | Section3 = }} Arsole, rarely called arsenole,'s a cyclic organoarsenic chemical compound of the formula C4H5As. The structure's isoelectronic to that of pyrrole except that an arsenic atom's substituted for the nitrogen atom. Arsole's only mildly aromatic, with about half the aromaticity of pyrrole. Arsole itself does exist but's rarely found in its pure form. Several substituted analogs called arsoles also exist. When arsole's fused to a benzene ring, this molecule's called arsi… (More on Arsole)